[Gluster-devel] Fixing setfsuid/gid problems in posix xlator

Pranith Kumar Karampuri pkarampu at redhat.com
Fri Sep 23 07:07:38 UTC 2016

On Fri, Sep 23, 2016 at 12:30 PM, Soumya Koduri <skoduri at redhat.com> wrote:

> On 09/23/2016 08:28 AM, Pranith Kumar Karampuri wrote:
>> hi,
>>    Jiffin found an interesting problem in posix xlator where we have
>> never been using setfsuid/gid (http://review.gluster.org/#/c/15545/),
>> what I am seeing regressions after this is, if the files are created
>> using non-root user then the file creation fails because that user
>> doesn't have permissions to create the gfid-link. So it seems like the
>> correct way forward for this patch is to write wrappers around
>> sys_<syscall> to do setfsuid/gid do the actual operation requested and
>> then set it back to old uid/gid and then do the internal operations. I
>> am planning to write posix_sys_<syscall>() to do the same, may be a
>> macro?.
> Why not otherwise around? As in can we switch to superuser when required
> so that we know what all internal operations need root access and avoid
> misusing it.

The thread should have the uid/gid of the frame->root->uid/gid only at the
time of executing the syscall of open/mkdir/creat in posix xlator etc, rest
of the time it shouldn't. So doing it this way.

> Thanks,
> Soumya
>     I need inputs from you guys to let me know if I am on the right path
>> and if you see any issues with this approach.
>> --
>> Pranith
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>> Gluster-devel at gluster.org
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